Study the bar graph carefully and answer the question that follows.
The following bar graph shows the scale of bluetooth earphones on online market places over the years.
Find the approx. percentage increase in the sale of earphones from 2017 to 2020.
In the given figure, the length of arc AB is equal to 3 times radius r of the circle.
Find the area of sector OAB in terms of radius r.
Simplify the expression \(
\frac{l^{2}-m^{2}}{(l+m)^{2}}
\), provided (l+m) ≠ 0.
If (a3+b3+c3 −3abc) = 405 and (a + b + c) = 15, find the value of (a−b)²+(b−c)²+(c−a)².
A and B can individually complete a piece of work in 18 days and 30 days, respectively. A and B started working together, but A left \(16\dfrac{2}{3}\) days before the work is completed and B alone completed the rest of the work. For how many days did A work?